/* Copyright (c) 2006 by M Aamir Maniar 
 * 
 * Permission is hereby granted, free of charge, to any person obtaining 
 * a copy of this software and associated documentation files (the 
 * "Software"), to deal in the Software without restriction, including 
 * without limitation the rights to use, copy, modify, merge, publish, 
 * distribute, sublicense, and/or sell copies of the Software, and to 
 * permit persons to whom the Software is furnished to do so, subject to 
 * the following conditions:
 * 
 * The above copyright notice and this permission notice shall be 
 * included in all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 * */

namespace Generic.DataStructures.Trees
{
    using System;
    using System.Collections.Generic;
    using System.Text;
    using Generic.Patterns;

    public class TreeNode<T> : IEnumerable<T>
    {

        internal TreeNode()
        {

        }

        public TreeNode(Tree<T> tree)
        {
            if (tree == null)
                throw new ArgumentNullException("Can not instantiate object because argument 'tree' is null.");

            Tree = tree;
            _children = new TreeNodeCollection<T>(tree, this);
        }

        public TreeNode(Tree<T> tree, T nodeValue)
            : this(tree)
        {
            _nodeValue = nodeValue;
        }


        public TreeNode<T> this[int index]
        {
            get { return Children[index]; }
            set { Children[index] = value; }
        }

        private TreeNodeCollection<T> _children;
        /// <summary>
        /// Gets the children.
        /// </summary>
        /// <value>The children.</value>
        public TreeNodeCollection<T> Children
        {
            get { return _children; }
            internal set
            {
                _children = value;
            }
        }


        private TreeNode<T> _parentNode;
        public TreeNode<T> ParentNode
        {
            get { return _parentNode; }
            set { _parentNode = value; }
        }

        public bool HasChildNodes
        {
            get
            {
                return _children.Count != 0;
            }
        }

        #region public T NodeValue
        private T _nodeValue;
        /// <summary>
        /// Gets or sets the value.
        /// </summary>
        /// <value>The value.</value>
        public T NodeValue
        {
            get { return _nodeValue; }
            set { _nodeValue = value; }
        }
        #endregion

        private Tree<T> _tree;
        public virtual Tree<T> Tree
        {

            get { return _tree; }
            internal
            set { _tree = value; }
        }



        #region IEnumerable<T> Members

        IEnumerator<T> IEnumerable<T>.GetEnumerator()
        {
            throw new Exception("The method or operation is not implemented.");
        }

        public System.Collections.IEnumerator GetEnumerator()
        {
            throw new Exception("The method or operation is not implemented.");
        }
        #endregion
    }
}
